The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The LM3556 is controlled via an I2C-compatible interface.
Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash
pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which
forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power
amplifier events or other high-current conditions, and an integrated comparator designed to monitor
an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0
mA to
46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.
For all available packages, see the orderable addendum at the end of the data sheet.| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source datasheet (Rev. D) | PDF | HTML | 23/10/2015 | |
| Informe | Common LED Functions and LED Driver Design Considerations | 21/09/2020 | |||
| Guía de selección | Power Management Guide 2018 (Rev. R) | 25/06/2018 | |||
| Nota sobre la aplicación | AN-2259 1.5A Synchronous Boost LED Flash Drvr w/ High-Side Cur Source Eval Board (Rev. A) | 30/04/2013 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
The Linux driver supports the LM355X series of LED Drivers. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
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| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| DSBGA (YFQ) | 16 | Ultra Librarian |
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